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668 Chapter 9: Management Tools and QoS Design

QoS Management Tool Summary

Table 9-5 lists many of the most important features of the various QoS management products, and identifies which products support the features.

Table 9-5 Summary of QoS Management Tool Features

Feature

QDM

QPM

IPM

SMS

SAA

 

 

 

 

 

 

Supports a wide variety of routers

Yes

Yes

Yes

Yes

Yes

 

 

 

 

 

 

Supports a wide variety of switches

No

Yes

No

No

No

 

 

 

 

 

 

Free?

Yes

No

No

No

No

 

 

 

 

 

 

Allows network-wide QoS policy definition, followed by

No

Yes

No

No

No

automatic deployment of appropriate configurations

 

 

 

 

 

 

 

 

 

 

 

Creates graphs of real-time performance

Yes

Yes**

Yes

No

No

 

 

 

 

 

 

Creates graphs of historical performance

Yes*

Yes

Yes

Yes

No

 

 

 

 

 

 

Creates historical graphs to compared to service levels

No

No

No

Yes

No

 

 

 

 

 

 

Requires extra software loaded into router/switch Flash

Yes

No

No

No

No

memory

 

 

 

 

 

 

 

 

 

 

 

End-user viewing of reports and configuration using a web

Yes

Yes

Yes

Yes

No

browser

 

 

 

 

 

 

 

 

 

 

 

Manages only a single device from a browser

Yes

No

No

No

No

 

 

 

 

 

 

Manages entire network from one browser window

No

Yes

Yes

Yes

No

 

 

 

 

 

 

Creates configuration for router probes that measure latency

No

No

Yes

Yes

No

and jitter

 

 

 

 

 

 

 

 

 

 

 

Implements the actual probes and responses when necessary

No

No

No

No

Yes

for measuring network performance

 

 

 

 

 

 

 

 

 

 

 

*QDM supports historical trending for up to five days of policy history.

**Through the use of the CB-QOS MIB

QoS Design for the Cisco QoS Exams

QoS design covers concepts as high level as thinking about how each application is used inside a company, all the way down to how to choose reasonable numbers for committed burst (Bc) when performing traffic shaping. Any way you look at it, QoS design involves manipulating QoS characteristics—bandwidth, delay, jitter, and loss—for overall benefit in a network.

Notice, however, that this section is not just titled “QoS Design,” but rather “QoS Design for the Cisco QoS Exams.” QoS design, unbounded, could require several chapters. Interestingly, there is only one objective for the DQOS exam that mentions design, and yes, the number of